Motor shaft and motor
By setting a pressure chamber and oil passage on the motor shaft, the problem of oil splashing was solved, and oil was accurately injected into the bearing, improving the lubrication effect and the stability of the motor.
Patent Information
- Application Number
- CN202520187717.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-06
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2035-02-06
AI Technical Summary
After leaving the oil hole, the oil splashes out tangentially, making it difficult to fall accurately into the bearing in the axial direction, which affects the lubrication effect and thus has an adverse impact on the stable operation and service life of the motor.
The system includes a pressure chamber and an oil passage. The pressure chamber increases the pressure of the oil inside, while the oil passage extends in the axial direction to ensure that the oil is accurately injected into the bearing, counteracting centrifugal force and improving lubrication.
It improves the accuracy and directionality of oil injection, ensures bearing lubrication, and enhances the stable operation and service life of the motor.
Smart Images
Figure CN223725136U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to motor shaft field, especially a kind of motor shaft and motor. BACKGROUND
[0002] The power density and system speed of new energy three-electric system (covering motor, electric control and speed reducer) are increasingly required in the current market, to meet these growing performance indicators, three-electric system gradually changes from traditional water cooling to oil cooling technology.
[0003] Under this background, the bearing configuration of motor end is also adjusted accordingly, from closed bearing to open bearing. Closed bearing is composed of metal shaft, metal ball and two side covers, and the metal ball is isolated from the outside world. Open bearing can see the metal ball. This structural change requires designing additional oil path to ensure the lubrication effect of the bearing. This improvement measure brings new problems to the shell design and processing of three-electric system. The shell needs to be re-optimized in structure to accommodate and layout the new oil path, and the processing technology becomes more complex, requiring higher precision and technical requirements, resulting in significant increase in production cost.
[0004] To realize bearing lubrication, an oil hole is usually added at the rear of the motor shaft. However, when the motor is in high-speed operation, the oil will splash out along the tangential direction after leaving the oil hole due to centrifugal force, making it difficult to accurately fall into the bearing in the axial direction, greatly affecting the lubrication effect, and further adversely affecting the stable operation and service life of the motor. SUMMARY
[0005] The utility model aims at solving the technical problem that oil will splash out along the tangential direction after leaving the oil hole, making it difficult to accurately fall into the bearing in the axial direction, thereby affecting the lubrication effect. The utility model provides a kind of motor shaft and motor, by setting booster chamber and oil channel, booster chamber carries out pressure promotion to oil in chamber, according to the position of bearing to determine the extension direction of oil channel, increase the accuracy of the trajectory of ejected oil, improve the lubrication effect of bearing.
[0006] To solve the above technical problems, the embodiment of the utility model discloses a kind of motor shaft, the motor shaft includes:
[0007] Oil inlet channel;
[0008] Oil inlet groove, the oil inlet groove is communicated with the oil inlet channel;
[0009] Booster chamber;
[0010] Oil channel, the oil inlet groove, the booster chamber and the oil channel are communicated in sequence, one end of the oil channel is used for bearing towards the outside world, and the extension direction of the oil channel intersects with axial direction.
[0011] According to the technical scheme, the pressure chamber is arranged, the oil in the pressure chamber is pressurized, the oil is accurately and stably ejected from the oil channel under the driving of high oil pressure, a part of centrifugal force is offset, and the accuracy of the oil ejection trajectory is improved.
[0012] According to the extension direction of the oil channel determined according to the position design of the bearing, the oil can be accurately ejected to the bearing, the oil keeps better directionality, the accuracy of the trajectory of the ejected oil is improved, and the bearing lubrication effect is improved.
[0013] According to another specific embodiment of the utility model, the pressure chamber comprises:
[0014] The first part is in communication with one end of the oil inlet groove;
[0015] The second part comprises:
[0016] The oil inlet is in communication with the other end of the first part;
[0017] The oil outlet is in communication with the oil channel, and the cross-sectional area of the oil outlet is smaller than that of the oil inlet.
[0018] According to the technical scheme, the cross-sectional area of the oil outlet is smaller than that of the oil inlet, so the oil pressure of the oil outlet is higher than that of the oil inlet, the oil can be ejected at high speed through the oil channel, a part of centrifugal force is offset, the oil keeps better directionality, is accurately ejected to the bearing, and the bearing lubrication effect is ensured.
[0019] According to another specific embodiment of the utility model, the cross-sectional area of the second part gradually decreases along the outward direction of the axial direction.
[0020] According to the technical scheme, the cross-sectional area of the pressure chamber gradually decreases, so the oil pressure in the pressure chamber gradually increases, the oil can be ejected at high speed through the oil channel, a part of centrifugal force is offset, the oil keeps better directionality, is accurately ejected to the bearing, and the bearing lubrication effect is ensured.
[0021] According to another specific embodiment of the utility model, the cross section of the second part is trapezoidal.
[0022] According to another specific embodiment of the utility model, one end of the first part is higher than the oil inlet groove along the outward direction perpendicular to the axial direction.
[0023] With the technical scheme, when the motor is in a high-speed running state, oil will adhere to the side wall of the oil inlet groove outwardly perpendicularly to the axial direction due to the centrifugal force. In this case, if one end of the first part is located lower than the oil inlet groove, the oil may not flow into the first part smoothly under the action of the centrifugal force, thereby hindering the normal oil transmission path.
[0024] Therefore, the end of the first part is arranged to be higher than the oil inlet groove. In this way, when the motor is in a high-speed running state, even if there is a centrifugal force, the oil in the oil inlet groove can still flow into the first part smoothly along the inner wall of the oil inlet groove, thereby ensuring the continuity and stability of oil transmission.
[0025] According to another specific embodiment of the present application, the diameter of the oil channel is smaller than the diameter of the oil outlet.
[0026] With the technical scheme, when the oil flows from the oil outlet with a large diameter into the oil channel with a small diameter, the oil pressure will continue to rise due to the smaller cross section, and therefore, the oil can be shot out of the oil channel at a high speed, offsetting part of the centrifugal force, so that the oil maintains better directionality and is precisely sprayed to the bearing, thereby ensuring the bearing lubrication effect.
[0027] According to another specific embodiment of the present application, the angle between the extension direction of the oil channel and the axial direction is a first angle, and the first angle is greater than 0° and less than 180°.
[0028] With the technical scheme, by changing the angle between the extension direction of the oil channel and the axial direction, the direction of the oil shot can be directly opposite to the bearing, thereby achieving a more controllable bearing lubrication effect.
[0029] According to another specific embodiment of the present application, the motor shaft comprises:
[0030] a large end, which is a hollow structure;
[0031] a small end, which is a hollow structure, and the large end is sleeved in the small end and is in internal communication, so as to form the oil inlet channel, and the oil inlet groove, the pressurizing cavity and the oil channel are arranged in the small end.
[0032] According to another specific embodiment of the present application, the small end comprises:
[0033] an insertion part, the large end is sleeved in the insertion part, and the oil inlet groove is arranged in the insertion part;
[0034] a limiting part, which is connected with the insertion part, and the limiting part abuts against the large end, and the pressurizing cavity and the oil channel are arranged in the limiting part.
[0035] The embodiment of the utility model discloses a motor, the motor includes:
[0036] The motor shaft of any one of the preceding claims;
[0037] The bearing is arranged on the motor shaft, and the oil channel is towards the bearing. BRIEF DESCRIPTION OF DRAWINGS
[0038] Figure 1 The connection schematic diagram of the motor shaft and the bearing of the utility model embodiment is shown.
[0039] Figure 2 The embodiment of the utility model shows Figure 1 The local enlarged view of A area in the middle.
[0040] Figure 3 The schematic diagram of the utility model embodiment pressure chamber and oil channel is shown.
[0041] MARKING OF DRAWINGS
[0042] The motor shaft 100;
[0043] The oil inlet channel 110;
[0044] The oil inlet groove 120;
[0045] The pressure chamber 130;
[0046] The first part 131;The second part 132;The oil inlet 1321;The oil outlet 1322;
[0047] The oil channel 140;
[0048] The big end 150;
[0049] The small end 160;The insertion part 161;The limiting part 162;
[0050] The bearing 200. DETAILED DESCRIPTION
[0051] The following describes the embodiments of the present application with specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosure. Although the description of the present application will be introduced in combination with the preferred embodiments, it does not mean that the features of the present application are limited to the embodiments. On the contrary, the purpose of introducing the present application in combination with the embodiments is to cover other options or modifications that can be extended based on the claims of the present application. In order to provide a deep understanding of the present application, many specific details will be included in the following description. The present application can also be implemented without using these details. In addition, in order to avoid confusion or obscure the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.
[0052] It should be noted that in the present specification, similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0053] In the description of the present embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.
[0054] The terms "first", "second", and the like are only used for differentiation and cannot be understood as indicating or implying relative importance.
[0055] In the description of the present embodiment, it should also be noted that unless otherwise explicitly specified and limited, the terms "provided", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present embodiment can be understood according to the specific circumstances.
[0056] In order to make the purpose, technical scheme and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the drawings.
[0057] Reference Figures 1 to 3The motor provided by the embodiment of the present application comprises a motor shaft 100 and a bearing 200.
[0058] The motor shaft 100 comprises an oil inlet channel 110, an oil inlet groove 120, a pressurizing cavity 130 and an oil channel 140. One end of the oil inlet groove 120 is communicated with the oil inlet channel 110, and the other end of the oil inlet groove 120, the pressurizing cavity 130 and one end of the oil channel 140 are sequentially communicated. The other end of the oil channel 140 is directed towards the bearing 200, and the extension direction of the oil channel 140 intersects with the axial direction X.
[0059] By means of the above technical solution, the pressurizing cavity 130 is arranged to increase the pressure of the oil (not shown in the figure) in the cavity. When the oil is driven by high oil pressure, the oil can be precisely and stably ejected from the oil channel 140, thereby offsetting a part of centrifugal force and improving the accuracy of the trajectory of the oil ejection.
[0060] According to the position design of the bearing 200, the extension direction of the oil channel 140 is determined, so that the oil can be precisely ejected to the bearing 200, the directionality of the oil is better, the accuracy of the trajectory of the ejected oil is increased, and the lubricating effect of the bearing 200 is improved.
[0061] In some possible implementation manners, referring to Figures 1 to 3 The pressurizing cavity 130 comprises a first part 131 and a second part 132. One end of the first part 131 is communicated with the oil inlet groove 120. The second part 132 comprises an oil inlet 1321 and an oil outlet 1322. The oil inlet 1321 is communicated with the other end of the first part 131, and the oil outlet 1322 is communicated with the oil channel 140. The cross-sectional area of the oil outlet 1322 is smaller than that of the oil inlet 1321.
[0062] By means of the above technical solution, the cross-sectional area of the oil outlet 1322 is smaller than that of the oil inlet 1321, so that the oil pressure of the oil outlet 1322 is higher than that of the oil inlet 1321. The oil can be ejected at high speed through the oil channel 140, a part of centrifugal force is offset, the directionality of the oil is better, the oil is precisely ejected to the bearing 200, and the lubricating effect of the bearing 200 is ensured.
[0063] In some possible implementation manners, referring to Figure 2 and Figure 3 In the direction outward along the axial direction X, the cross-sectional area of the second part 132 gradually decreases.
[0064] By means of the above technical solution, the cross-sectional area of the pressurizing cavity 130 gradually decreases, so that the oil pressure in the pressurizing cavity 130 gradually increases. Therefore, the oil can be ejected at high speed through the oil channel 140, a part of centrifugal force is offset, the directionality of the oil is better, the oil is precisely ejected to the bearing 200, and the lubricating effect of the bearing 200 is ensured.
[0065] In some possible embodiments, referring to Figure 3 , the second part 132 is in the shape of an isosceles trapezoid.
[0066] It should be noted that the shape of the second part 132 is not limited in the embodiments of the present application, for example, in other possible embodiments, the shape of the second part 132 can be a right trapezoid, a semicircle, a semi-ellipse, etc.
[0067] In some possible embodiments, referring to Figure 2 and Figure 3 , the one end of the first part 131 is higher than the oil inlet groove 120 in the direction perpendicular to the axial direction X.
[0068] With the above technical solution, when the motor is in a high-speed running state, the oil will adhere to the side wall of the oil inlet groove 120 perpendicular to the axial direction X due to the centrifugal force. In this case, if the one end of the first part 131 is located lower than the oil inlet groove 120, the oil may not flow smoothly into the first part 131 under the action of the centrifugal force, hindering the normal oil transmission path.
[0069] Therefore, the one end of the first part 131 is arranged to be higher than the oil inlet groove 120. In this way, when the motor is in a high-speed running state, even if there is a centrifugal force, the oil in the oil inlet groove 120 can still flow smoothly along the inner wall of the oil inlet groove 120 into the first part 131, thereby ensuring the continuity and stability of the oil transmission.
[0070] In some possible embodiments, referring to Figure 2 and Figure 3 , the diameter d1 of the oil channel 140 is smaller than the diameter d2 of the oil outlet 1322.
[0071] With the above technical solution, when the oil flows from the large-diameter oil outlet 1322 into the small-diameter oil channel 140, the oil pressure will continue to rise due to the smaller cross section, and therefore the oil can be shot out of the oil channel 140 at high speed, offsetting part of the centrifugal force, keeping the oil better directional, and accurately sprayed to the bearing 200, thereby ensuring the lubrication effect of the bearing 200.
[0072] In some possible embodiments, the angle between the extension direction of the oil channel 140 (i.e. the direction a in Figure 3 ) and the axial direction X is a first angle a, and the first angle a is greater than 0° and less than 180°.
[0073] By changing the included angle (i.e., the first angle α) between the extension direction of the oil channel 140 and the axial direction X, the direction of the oil liquid ejection can be directly opposite to the bearing 200, and a more controllable bearing 200 lubrication effect can be achieved.
[0074] It should be noted that the specific value of the first angle α is not limited in the embodiments of the present application, for example, in other possible embodiments, the specific value of the first angle α can be 49°, 68°, 103.7°, etc.
[0075] In some possible embodiments, referring to Figures 1 to 3 , the motor shaft 100 includes a large end 150 and a small end 160, both of which are hollow structures, the large end 150 is sleeved on the small end 160 and is internally communicated to form an oil inlet channel 110, the oil inlet groove 120, the booster cavity 130 and the oil channel 140 are arranged on the small end 160.
[0076] It should be noted that in the present technical solution, the large end 150 and the small end 160 are distinguished according to the diameter, as shown in Figure 1 , the diameter of the large end 150 is larger than that of the small end 160. In other possible embodiments, the large end 150 and the small end 160 can also be distinguished according to the functional use of the motor shaft 100, for example, the driving end of the motor shaft is the large end 150, and the non-driving end of the motor shaft is the small end 160.
[0077] In some possible embodiments, referring to Figures 1 to 3 , the small end 160 includes an insertion part 161 and a limiting part 162, the large end 150 is sleeved on the insertion part 161, and the oil inlet groove 120 is arranged on the insertion part 161. The limiting part 162 is connected with the insertion part 161, the limiting part 162 abuts against the large end 150, and the booster cavity 130 and the oil channel 140 are arranged on the limiting part 162.
[0078] Although the present application has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood that the above description is a further detailed description of the present application only with reference to specific embodiments, and the specific implementation of the present application should not be limited to these descriptions. Those skilled in the art can make various changes in form and details without departing from the spirit and scope of the present application, including making a number of simple deductions or substitutions.
Claims
1. An electric machine shaft, characterized in that, The motor shaft comprises: an oil inlet channel; an oil inlet groove in communication with the oil inlet channel; a pressurizing cavity; an oil passage in communication with the oil inlet groove, the pressurizing cavity and the oil passage in sequence, one end of the oil passage being used for a bearing facing the outside, and the extension direction of the oil passage intersecting the axial direction.
2. The motor shaft of claim 1, wherein The pressurizing cavity comprises: a first part in communication with the other end of the oil inlet groove; a second part comprising: an oil inlet in communication with the other end of the first part; an oil outlet in communication with the oil passage, the cross-sectional area of the oil outlet being smaller than that of the oil inlet.
3. The motor shaft of claim 2, wherein In the direction outward along the axial direction, the cross-sectional area of the second part gradually decreases.
4. The motor shaft of claim 2 or 3, wherein The cross section of the second part is trapezoidal.
5. The motor shaft of claim 2, wherein In the direction outward perpendicular to the axial direction, one end of the first part is higher than the oil inlet groove.
6. The motor shaft of claim 2, wherein The diameter of the oil passage is smaller than that of the oil outlet.
7. The motor shaft of claim 1, wherein The angle between the extension direction of the oil passage and the axial direction is a first angle, the first angle being greater than 0° and less than 180°.
8. The motor shaft of claim 1, wherein The motor shaft comprises: a large end being a hollow structure; a small end being a hollow structure, the large end being sleeved in the small end and being in internal communication to form the oil inlet channel, the oil inlet groove, the pressurizing cavity and the oil passage being arranged in the small end.
9. The motor shaft of claim 8, wherein The small end comprises: an insertion part, the large end being sleeved in the insertion part, and the oil inlet groove being arranged in the insertion part; a limiting part connected with the insertion part, the limiting part abutting against the large end, and the pressurizing cavity and the oil passage being arranged in the limiting part.
10. An electric machine characterized by The motor comprises: the motor shaft according to any one of claims 1 to 9; a bearing arranged in the motor shaft, and the oil passage facing the bearing.